Method to construct station tunnels with low subsidence of earth surface

FIELD: mining.

SUBSTANCE: method to construct station tunnels with low subsidence of earth surface includes erection of an advance support and a temporary support along a tunnel vault, erection of permanent lining and mining of bottomhole rock, according to the invention, in a bottomhole under protection of the advance support along the longitudinal axis of the tunnel there are injection fibreglass anchors installed, the temporary support is erected providing for maintenance of the advance support, and mounted from steel arcs directly following face advance with filling of the support space with concrete, the permanent lining is erected after temporary support concrete gains strength. At the same time injection fibreglass anchors are cut in layers with a tunnelling unit together with rock in the bottomhole as it advances. At the same time the advance support is erected by drilling of wells along the tunnel vault at the angle to its longitudinal axis, placement of metal pipes in wells and filling of pipes with cement mortar.

EFFECT: increased quality of tunnel construction by reduction of earth surface subsidence at main stages of construction.

2 cl, 2 dwg

 

The invention relates to the construction of underground structures and can be used in the construction of the deeper stations in moderately and weakly resistant soils.

The known method of tunnel construction in moderately and weakly resistant soils (patent RU C1 2096622, CL E21D 9/00, E21D 13/04 was investigated, 1997), including the construction of advanced and temporary supports on the arch of the tunnel, under the protection of the permanent lining construction and development of the breed slaughter.

The disadvantage of this method is that during its implementation occur large displacement of the soil mass and precipitation of the earth surface, which reduces the quality of the construction of the tunnels.

The known method of tunnel construction in moderately and weakly resistant soils (patent RU C1 2205957, CL E21D 9/00, E21D 13/04 was investigated, 2002)adopted for the prototype. The method includes the construction of advanced and temporary supports on the arch of the tunnel, under the protection of the permanent lining construction and development of the breed slaughter.

The disadvantage of this method consists in the fact that the project would occur large displacement of the soil mass and upsetting the earth's surface. This is due to large displacements of the roof and bottom of the tunnel on the main stages of construction, which reduces the quality of the construction of the tunnels.

The technical result of the invention is to improve the quality of tunnel construction by reducing the sediment of the earth surface on the main floor the groin construction.

The technical result is achieved in that the method of construction of the station tunnels with low precipitation the earth's surface, including the construction of advanced lining and temporary supports on the arch of the tunnel, under their protection the construction of the permanent lining and the development of rock bottom, according to the invention in the pit under the defense advanced lining along the longitudinal axis of the tunnel set injection fiberglass anchor, temporary shoring is erected to ensure maintenance of advanced lining and mount steel arches directly behind podvigina face with the filling Sakrebulo space with concrete and permanent lining erected after curing concrete temporary piles, while injecting fiberglass anchor layers cut tunnel Assembly together with rock in the pit as it podvigina.

The technical result is also achieved by the fact that ahead of the support is constructed by drilling holes on the tunnel ceiling at an angle to its longitudinal axis, accommodation in wells metal pipes and fill pipes with cement mortar.

The method is implemented as follows (as shown in the drawing).

The method of construction of the station tunnels with small rainfall earth surface includes construction of an advanced lining 1 and the temporary roof support 2 on the tunnel ceiling 3, under their protection vowed is the permanent lining 4 and the development of rock bottom 5. In the pit 5 under the defense advanced lining 1 along the longitudinal axis of the tunnel 3 sets of injection fiberglass anchor 6. Temporary shoring 2 erect with maintenance of advanced lining 1 and the mount of steel arches directly behind podvigina bottom 5 with filling Sakrebulo space with concrete 7. Permanent lining 4 erect after curing concrete 7 temporary roof support 2. Injection fiberglass anchor 6 layers cut tunnel unit together with the rock in the bottom 5 as it podvigina.

Ahead of the support 1 being constructed by drilling holes on the tunnel ceiling at an angle to its longitudinal axis, accommodation in wells metal pipes and fill pipes with cement mortar.

Install injection fiberglass anchors in the face along the longitudinal axis of the tunnel layer by cutting them as podvigina slaughter leads to the fact that the breed slaughter permanently rigidly connected to the array and is not able to move in a goaf. This limits the displacement of the soil mass in front of the tunnel and above the tunnel and reduces precipitation the earth's surface. The erection of temporary piles of steel arches directly behind podvigina slaughter eliminates periods of time when the bottom part of the tunnel is in a loose condition and test b is greater offset, as it happens in traditional construction technologies tunnels. It also limits the sediments of the earth's surface.

Thus, reinforcement of the roof and bottom of the tunnel on the main stages of construction of the tunnel the proposed method reduces the displacement of the soil mass and upsetting the earth's surface, which increases the quality of construction of underground structures.

1. The method of construction of the station tunnels with low precipitation the earth's surface, including the construction of advanced lining and temporary supports on the arch of the tunnel, under their protection the construction of the permanent lining and the development of rock bottom, characterized in that the bottom under advanced protection lining along the longitudinal axis of the tunnel set injection fiberglass anchor, temporary shoring is erected to ensure maintenance of advanced lining and mount steel arches directly behind podvigina face with the filling Sakrebulo space with concrete and permanent lining erected after curing concrete temporary piles, while injecting fiberglass anchor layers cut tunnel unit together with the breed in the pit on as it podvigina.

2. The method according to claim 1, characterized in that the better the support is constructed by drilling holes on the tunnel ceiling at an angle to its longitudinal axis, accommodation in well the metal pipes and fill pipes with cement mortar.



 

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8 cl, 16 dwg

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FIELD: building, particularly underground structures built under difficult mining and geological conditions, namely in presence of soft watered grounds at tunnel base.

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